I'm running a 9406-170 with a 9910-080 UPS. recently the system powered down hard and would not power back up and the UPS powered off as well. When i reset the ups and attempt to re-ipl the system, the system starts to ipl and then there is a clicking noise in the ups and everything shuts down again. I removed the UPS from the power sequence and plugged the AS/400 directly to the wall outlets and it IPL'd and is running fine.
Do I need to replace the batteries, the UPS or is there a setting on the system i need to change? It seems to me that even if the batteries on the UPS are no good, the power should passthru and the system should IPL.
Any ideas?

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It definitely sounds as though the UPS is the problem. Whether it would be more cost-effective to replace batteries or just replace the entire UPS is something only you can determine. You might see if the UPS manufacturer provides any information on diagnostics.

Sounds to me like it's the UPS. I'll second what Splat said but interject my own comment:
your manufaturer should have all the sounds and light codes documented for each specific UPS. you'll be able to tell a lot more from those documents.
Hope this helps!
-Schmidtw

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